The announcers made some reference to point differential being used in Europe, but I didn't catch it all.
Perhaps they use it in another sport like soccer?
In Europe they have domestic cups that happen during the season that are single elimination, no group stage stuff.
They also have larger, Europe wide "League Cups" where the best teams from each country play each other... in that point differential can be a tie breaker but it is only within a group. It's a 4 team group, the top 2 from each group advance, they play each other twice, if teams are tied then point difference is a tie breaker, which is fair because all 4 teams played the same schedule.
Also, none of these European cups, either domestic or Europe wide, have any impact on the standings in their seasons. They're completely separate competitions.
The finals of these foreign cups also come at the end of the year.
The NBA had to do 5 team groups because there are 30 teams... they didn't have them play each other twice, probably because it would have chewed up too much of the schedule, they have to do this dumb tie breaker system because the tournament is so rushed they couldn't do a proper playoff. And the games count for both the season record and the tournament because the NBA couldn't add more games to the already brutally long schedule (European leagues play like 40 game seasons) and for some dopey reason the NBA decided to rush the whole thing and have it end 2 months after it starts.
The result is an incoherent mess.
I wasn't against the idea, but the execution has been horrible.